If you want the most free space, ram, do it like here
You can test this with avail.sis
for the 9210ihere
to get avail.sis make a membership on the forum from nokia then you can downlaod it from this site
http://www.forum.nokia.com/files/disclaimer/1,1167,1408,00.html
With Avail application it is possible to set the amount of free space of RAM, Serial Flash and memory card. This might be useful for testing low memory situations.